fix(deps): update k8s.io/test-infra digest to 6b125a8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
k8s.io/test-infra	require	digest	b936f25 -> 6b125a8

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: go get -d -t ./...
go: -d flag is deprecated. -d=true is a no-op
go: downloading github.com/sirupsen/logrus v1.9.3
go: downloading k8s.io/test-infra v0.0.0-20250312233747-6b125a8d53c3
go: downloading sigs.k8s.io/yaml v1.4.0
go: downloading github.com/ghodss/yaml v1.0.0
go: downloading k8s.io/apimachinery v0.26.5
go: downloading golang.org/x/sys v0.8.0
go: downloading gopkg.in/yaml.v2 v2.4.0
go: github.com/ti-community-infra/configs/cmd/merge imports
	k8s.io/test-infra/prow/config/org: cannot find module providing package k8s.io/test-infra/prow/config/org
go: github.com/ti-community-infra/configs/orgs tested by
	github.com/ti-community-infra/configs/orgs.test imports
	k8s.io/test-infra/prow/github: cannot find module providing package k8s.io/test-infra/prow/github

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

Hi @renovate[bot]. Thanks for your PR.

I'm waiting for a ti-community-infra member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.